McCafferty, who works in the criminal file room at the Justice Center, is accommodating and efficient, and her grace is by no means limited to reporters, who rely on clerks the way climbers need Sherpas. One day, a man came to her counter with a confused request. It wasnt clear if he needed documents to expunge his record or the formula for converting Fahrenheit to centigrade. McCafferty never condescended, rolled her eyes, or got testy. She tried to help. She gets it: If your workplace has a public window, be prepared to deal with the public.